//
//  MainTabBar.swift
//  SinaWeibo
//
//  Created by 李旭阳 on 15/11/9.
//  Copyright © 2015年 apple. All rights reserved.
//

import UIKit

class MainTabBar: UITabBar {
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupUI()
    }
    
    private func setupUI(){
        addSubview(composeBtn)
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        let w = bounds.width / 5
        let h = bounds.height
        let rect = CGRect(x: 0, y: 0, width: w, height: h)
        
        //定义递增变量
        var index: CGFloat = 0
        for subview in subviews{
            if subview.isKindOfClass(NSClassFromString("UITabBarButton")!){
                //修改frame 让 2 空出来
                subview.frame = CGRectOffset(rect, index * w, 0)
                
                //if index == 1{
                //    index++
                //}
                //index++
                
                index += index == 1 ? 2 : 1
            }
        }
        //设置 ＋ 按钮的位置
        composeBtn.frame = CGRectOffset(rect, w * 2, 0)
        bringSubviewToFront(composeBtn)
        
    }
    
    lazy var composeBtn: UIButton = {
        
        let btn = UIButton()
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: .Normal)
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: .Highlighted)
        
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: .Normal)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: .Highlighted)
        
        return btn
    }()
}
